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Re:Ask HN: I'm 40 and feel my mental ability declining. Prog... by smnscu on Tuesday January 10, 2023 @09:59AM (#34325799)
Only writing this because I didn't find anyone else referencing it, but I'd also check for some sort of a deficiency. It turns out that I was severely vitamin D deficient, as soon as I started taking it daily all my long-term health problems (including mental fog and memory issues) pretty much disappeared.
Re:Ask HN: I'm 40 and feel my mental ability declining. Prog... by fakeTitsLookSad on Tuesday January 10, 2023 @10:05AM (#34325891)
I would like to add, that I had the same issue. I was consistently worse at my job during winter. I picked up vitamin d and feel much better mentally. And i can finally work properly.

One more thing - co2 levels inside room can have significant impact on your mental capacity. So open the windows every morning, lunch and evening.